Troubleshooting I don't feel suction from my Philips Avent breast pump If you do not feel any suction from your Philips Avent breast pump, you can often easily fix it yourself. Find out how with these simple steps. Play Pause Tips and tricks Check if you have assembled the breast pump correctly by following the steps in the Directions for Use. Make sure that the silicone tube is firmly attached to the motor unit and to the cap and diaphragm. Also, make sure that the pump is positioned correctly on the breast to allow for a vacuum to occur. Still not working? If you still do not feel any suction, please contact Philips Customer Care.